Friction shock-absorbing mechanism



pt. 3o 1924.

2 Sheets-Sheet 1 Filed Nov. 8, 1922 fig! wl www yfi m` m Vw mf/ ma Patented Sept., 3U, idg/l..

lll lil iii;

reges B n. all Y STACY B. HASLTINE, OF CHCAG, LLINOIS, ASSIGNR, BY MESNE ASSGNTJIENTS, T0

W'. H. IvINER, UJG., il. CGRPRATON OF DELA Application lcd November To all whom it 'may conce/rn.'

Be it known that l, S'IAcr B. l-Lisni/rrnn, a citizen of the United States, residing at Chicago, .in the county of Coeli and State of illinois, have invented a certain new and useful Improvement in Friction Shock-ibsorbing Mechanisms, of which the following is a full, clear, concise, and enact description, reference being had to the accompanying drawings, forming a part of this speciiication,

This invention relates to improvements in lfriction shock absorbing mechanisms.

One object of the invention is to provide a friction shock absorbing' mechanism especially adapted for railway draft riggings and wherein are obtained high capacity and certain release, but more specifically such a mechanism wherein the desired high trictional capacity is obtained primarily by one set of wedge faces and the release insured by a different set of inclined faces.

More specifically, an object of the inven- Yon is to provide, in a mechanism of the l posed between friction shoes for the purpose or better distributing the lateral pressure more eliiciently throughout the length of the friction shoes.

.ln the drawings forming a part of this specification, Figure 1 is a horizontal longitudinal sectional view of a portion of a railway draft rigging showing my improvements in connection therewith, parts being broken away to better accommodate the iigure on the sheet. Figure 2 isa front end elevation of the shocl; absorbing mechanism proper. Figure 3 is a vertical transverse sectional view of the shock absorbing mechanism proper corresponding to the line 3-3 of Figure 1. Figure l is a longitudinal sectional view taken substantially on the line .je l cic Figure 2, And Figures 5 and 6 are detail perspectives of one or the elements oi' the spreading means and one'of the friction slices, respectively.

ln said drawings, 10 denote channel draft sills of a car underframe to the inner faces of which are secured front stop lugs .il and rear stop lugs 12. A portion ci' a draw bar is indicated at 13, the same being operatively associated with the shock absorbing mechanism proper by a hooded cast yolre 14 within which is disposed the shock 3, 1922. Serial No, 599,639.

absorbing mechanism proper and a iront follower llhe yolre and parts therewithin are supporter-L in operative position by la detachable saddle plate 16.

rl'he improved shock absorbing mechanism proper, as shown, comprises, broadly, a combined friction shell and spring cage casting A; twin arranged springs B B; a spring follower C; a pair oit' friction shoes D and E, an outer spreading element F; an inner' spreading element G; an auxiliary spreadelement li; a retainer bolt J; and an anchor bar The casting il., as shown, is of rectangular cross section having `top and bottom walls 172-17, side walls 18-18 and rear vertical wall 19 integrally uniting the top and bottom walls 1i. The side walls 18 are lett comparatively short to thereby leave the major portion ci the sides oi the casting il open so as to permit of the insertion and removal of the springs and certain other parts. The side walls 18, on their inner sides, are recessed, as indicated at 18a to receive detachable and renewable hardened liners 20, each oii the latter, on its inner side, providing a longitudinally extending shell friction surface 21.

Fach of the friction shoes D and E, which are laterally opposed to each other within the shell, is provided on its outer side with a longitudinally extended dat friction surlace 22 cooperable with the corresponding adjacent shell :friction surface 21. @n its inner side, the shoe D, at its outer end, is provided with an inclined face 23 which e241- tends rearwardly and toward the axis of the mechanism at a relatively acute and true wedging angle with respect to forces applied parallel or substantially parallel to theaxis et the mechanism. Similarly, the other triction shoe is provided with a keen angle wedgine face 2li, the latter, however, being disposed a short distance inwardly oithe wedge tace rllhe pressure receiving and transmitting outer spreading element F is provided on its outer side with a fiat bearing tace 25 engaging the inner :tace of the iollower 15. On one side adjacent the shoe l), the element Y 'ided with an inclined tace 123 ei;- tending at the same angle as, and cooperable with, the wedge tace 23 oi" said shoe D. Un its opposite side, the element F is provided with another face 26 extending across the `respect to the axis of the mechanism.

The second element G of the main spreading means is of generally triangular cross section, as clearly shown in Figure 1, and on its outer side is provided with an inclined face 126 extending at the same angle as, and coo}r erable with.. the blunt angle face 26 of the element F. On its other side, the element G isprovided with another face 12-1 extending at the same angle as, and cooperablel with, the wedge face 21 of the shoe E.

Inwardly of the enlargement upon which the wedge face 211 is provided, the shoe E is formed with a rounded fulcrum bearing 27 for one end of the kidney-shaped cam rocker lever or auxiliary spreading element H. The latter has its convex surface 28 arranged to bear upon a concave bearing surface 29 formed on the shoe l) at a point inwardly of the wedge face 23 thereof. 1n actual practice, the radius of the bearing face 29 will be somewhat greater than the radius of the convex surface 28 of the element H. The spreader element G, at its inner end, is rounded or convexed, as indicated at 30, and has a combined sliding and rolling action upon the rounded bearing surface 31 of the auxiliary spreading element i H, the point of contact therebetween being approximately in line with the axis of the mechanism.

All three elements, F, G and 1v1, are suitably apertured to accommodate the shank of the retainer bolt J, `as clearly shown in Figure 1, the outer end of said bolt being anchored to the element F and the inner end thereof being anchored beneath a. slotted crei-hanging flange 32 formed on the front side of the anchor bar K. The latter entends vertically within the casting A, as viewed in the drawings, the top and bottom ends of said bar K working within longitudinally disposed grooves formed on the inner side of 'the top and bottom wall of the casting A. As will be apparent from an inspection of Figure t, the anchor bar K limited in its outward. movement. to the position therein shown, and, consequent ly, the retainer bolt is adapted to hold all of the parts in assembled position and also may be utilized to place the springs under initial compression.

The inner ends of the friction shoes D and E bear upon a spring follower C, the latter in turn bearing upon the front ends of the twinl arranged springs 13 so as to thereby provide yielding resistance for relative movement between the friction shoes and the shell.

in operation, assuming a compressionl coacting faces 126 thereon extend at such a blunt angle with respect to the applied force that there will be no slippage, er appreciablel slippage, therebetween. Consequently, the two element-sF and G, acting substantially as a solid unit, will have the effect of a single wedge with keen angle faces 123 and 124, thereby producing a heavy spreading action uponl the shoes D and E near their outer ends. The two elements F and G acting as above described with respect to the shoes D and E, will tend to inove inwardly of the shoes D and E, and, consequently, tend to induce the element H to rock upon the pivot or fulcirum forming bearing 27. As the 4element H is thus induced to rock, the convex surface of the element H tends to slide along the concave bearing surface 29 of the shoe D, and, hence, to induce further spreading or separation of the two shoes D and E at points disposed considerably inwardly of the points where the main spreading action takes place. 1n this manner, it will be apparent that 1 distribute the spreading action throughout a considerable. .length of the shoes D and E, thus insuring evenly distributed pressure over the engaging friction surfaces of the shoes and shell.

Upon removal of the actuating force, the element F is free to fall away from the shoe D and other wedge element G by reason of the blunt releasing angle of the cooperating faces 26 and 126, and also because of the fact kthat the included angle between the wedge face 23 and the face 126 isv relatively obtuse so that there will be no danger of sticking of the parts, as will be obvious. As soon as the initial release takes place between the elements F and G, Vit is evident that the latterwill then be free te collapse with respect to the shoe E and thereafter all of the parts of the friction unit may be easily projected outwardly to their normal full release position under the influence of the expanding springs.

Although 1 have herein shown and described what 1 now consider the preferred manner of carrying out my invention, the same is merely illustrative and l c'ontern plate all changes andinodifications that come within the scope of the claims appended hereto.

1 claim: v

1. 1n a friction shock absorbing mechanism, the combination with a friction shell having opposed interior friction surfaces; of a spring resista-nce; opposed friction shoes cooperable with the shell; pressure receiving and transmitting spreading means;

said shoes and means having a plurality of sets of faces inclined relatively to the axis of the mechanism, part of which are arranged at a relatively keen wedgefacting angle and others at a relatively blunt vre- Llo leasing angle, and auxiliary spreading means between and having direct engagement `with said opposed frictionshoes, said auxiliary spreading means having also engagement with and receiving pressure from said first named spreading means, and having its movement inwardly of the shell directly opposed by contact With said slices.

2. ln a friction shock absorbing mechanism, the combination with a friction shell having opposed interior friction surfaces; of a. spring resistance; opposed friction shoes coope-rable- With the shell; pressure receiving and transmitting spreading means, said shoes and means having a plurality of sets of faces inclined relatively to the axis of the mechanism, part of which are arranged at a relatively keen Wedge-acting angle and others at relatively blunt releasing angle; and auxiliary spreading means between and having direct engagement with said opposed friction shoes, said auxiliary spreading means having also engagement with and receiving pressure from said first named spreading means, said auxiliary spreading means comprising a cam lever.

ln a friction shock absorbing mechanism, the combination With a friction shell having opposed interior friction surfaces; of a spring resistance; opposed friction shoes cooper-able `vvith the shell; pressure receiving and transmitting spreading means comprising tyvoelements, each element having Wedge engagement with a shoe and the two elements having blunt angle engagement with each other; and auxiliary spreading means between, and having direct engagement with, said opposed friction shoes inwardly of the iirst named spreading means, said auxiliary spreading means having engagement with one of said elements.

ln a friction shoclr absorbing mechanism, the combination `with a friction shell having opposed interior friction surfaces; of a spring resistance; opposed friction slices cooperable With the shell; pressure receiving and transmitting spreading means comprising two elements, each element having Wedge engagement with a shoe and the two elements having blunt angle engagement with each other; and auxiliary spreading means between, and having direct engagement with, said opposed friction shoes inwardly of the first named spreading means, said auxiliary spreading means having engagement with one of said elements,` said auxiliary spreading means comprising a cam lever.

5. ln a friction shoclt absorbing mechanism, the combination With a friction shell having opposed interior friction surfaces; of a spring resistance; opposed friction shoes cooperable with the shell; a pressure receiving and transmitting element having keen Wedge angle engagement With one shoe; a second pressure transmitting element having heen angle engagement with the other shoe and relativelyblunt angle engagement With the first named element; and auxiliary spreading means disposed inwardly of said second named element and having engagement with the latter and also with each of the shoes.

6. ln a friction shock absorbing mecha-- nism, the combination with a friction shell having interior longitudinally extending friction surfaces; of friction shoes cooperable with said shell; a spring resistance; a multiple part wedge cooperable with the shoes, the parts of said Wedge having rela-- tively keen angled ivedging engagement With the shoes under actuating forces applied to compress the mechanism, said parts of the Wedge having blunt releasing angle engagement with each other, permitting collapse upon oessation of the actuating forces; and auxiliary spreading means operative directly between the friction shoes.

7. ln a friction shock absorbing mechanism, the combination with a friction shell; of a spring resistance; an expansible friction unit movable Within said shell7 said nuit comprising a plurality of parts having three sets of transversely opposed cooperating faces all inclined relatively to the axis if the shell, at least one of said sets of faces extending at a keen vvedging angle With respect to applied actuating forces and at least one of said sets at a readily releasing angle; and auxiliary spreading means disposed inwardly of said unit in spaced relation to said springresistance and having Contact with both of said shoes and one of the parts of said unit.

8. ln a friction shock absorbing mechanism, the combination with a friction shell having interior longitudinally extending friction surfaces; of friction shoes cooperable with said shell; a spring resistance; a multiple part Wedge cooperable With the shoes, the parts of said Wedge having relatively lreen angled Wedging engagementwith the shoes under actuating forces applied to compress the mechanism, said parts of the Wedge having blunt releasing angle engagement With each other, permitting collapse upon cessation of the actuating forces; and auxiliary spreading means operative directly between the friction shoes, said auxiliary spreading means comprising a cam lever pivoted with respect to one of the shoes.

9. In a friction shock absorbing mechanism, the combination with a friction shell; of a spring resistance; an expansible friction unit movable within said shell, said unit comprising a plurality of parts having three sets of transversely opposed cooperating faces all inclined relatively to the axis of the shell, at least one of said sets of llO faces extending at a keen Wedging angle with respect to applied actuating` forces and at least one 0f said sets at a readily releasing angle; and auxiliary spreading` means disposed inwardly of said unit and having contact with both of said shoes and one of the parts of said unit, said auxiliary spreading means comprising a cam lever pivoted with respect to one of the shoes and slidable with respect to the other 0f the shoes.

10. In a friction shock absorbingmechanism, the combination with a friction shell having interior longitudinallv extending friction surfaces; of a spring resistance; opposed friction shoes cooperable with the friction shell; a pressure receiving and transmittingelement having` keen angled Wedging engagement with one of said shoes; a second pressure transmitting element having blunt angle engagement With said first element and keen Wedge angle engagement with an opposed shoe; and an arcuate cani lever pivolied with respect to one of said shoes and having curved bearing engagement with an opposed shoe and With said second named element.

In witness that I claim the foregoing .I have hereunto` subscribed my naine this 29th dav of teptembe131922.

STACY B. HASELTINE. Witnesses:

UNA C. Grasser, H. M. DRAME. 

